/*
* 38专题 中奖名单不间断循环JS
* @author jon
* @email 191777962@qq.com
*/

//添加事件响应函数的函数，与本效果无关
function addEventSimple(obj, evt, fn) {
  if (obj.addEventListener) {
    obj.addEventListener(evt, fn, false);
  } else if (obj.attachEvent) {
    obj.attachEvent('on' + evt, fn);
  }
}
addEventSimple(window, 'load', initScrolling);

//保存想要滚动的容器
var scrollingBox;
var scrollingInterval;
//用于记录是否"滚到头"过一次
var reachedBottom = false;
//记录第一次滚到头时候的scrollTop
var bottom;
//初始化滚动效果
function initScrolling() {
  scrollingBox = document.getElementById("g-itm");
  //样式设置，与滚动基本无关，应该用CSS设置。
  //scrollingBox.style.height = "160px";
  //scrollingBox.style.overflow = "hidden";
  //滚动
  scrollingInterval = setInterval("scrolling()", 100);
  //鼠标划过停止滚动效果
  scrollingBox.onmouseover = over;
  //鼠标划出回复滚动效果
  scrollingBox.onmouseout = out;
}

//滚动效果
function scrolling() {
  //开始滚动,origin是原来scrollTop 
  var origin = scrollingBox.scrollTop++;
  //如果到头了
  if (origin == scrollingBox.scrollTop) {
    //如果是第一次到头
    if (!reachedBottom) {
      scrollingBox.innerHTML += scrollingBox.innerHTML;
      reachedBottom = true;
      bottom = origin;
    } else {
      //已经到头过，只需回复头接尾的效果
      scrollingBox.scrollTop = bottom;
    }
  }
}



function over() {
  clearInterval(scrollingInterval);
}

function out() {
  scrollingInterval = setInterval("scrolling()", 100);
}